#import <Foundation/Foundation.h>


@interface DDRSAWrapper : NSObject

#pragma mark - SecKeyRef
- (BOOL)generateSecKeyPairWithKeySize:(NSUInteger)keySize publicKeyRef:(SecKeyRef *)publicKeyRef privateKeyRef:(SecKeyRef *)privateKeyRef;

- (NSData *)publicKeyBitsFromSecKey:(SecKeyRef)givenKey;
- (SecKeyRef)publicSecKeyFromKeyBits:(NSData *)givenData;

- (NSData *)privateKeyBitsFromSecKey:(SecKeyRef)givenKey;
- (SecKeyRef)privateSecKeyFromKeyBits:(NSData *)givenData;

/*
 padding ： kSecPaddingNone 或 kSecPaddingPKCS1
 */
- (NSData *)encryptWithKey:(SecKeyRef)key plainData:(NSData *)plainData padding:(SecPadding)padding;
- (NSData *)decryptWithKey:(SecKeyRef)key cipherData:(NSData *)cipherData padding:(SecPadding)padding;


- (NSData *)encryptWithPrivateKey:(SecKeyRef)key plainData:(NSData *)plainData;
- (NSData *)decryptWithPublicKey:(SecKeyRef)publicKey cipherData:(NSData *)cipherData;

#pragma mark - 指数和模数
- (NSData *)getPublicKeyExp:(NSData *)pk;
- (NSData *)getPublicKeyMod:(NSData *)pk ;
/*
 在 iOS9 以上的系统 模数前面要加 00，不然会转换失败
 
 const char fixByte = 0;
 NSMutableData * fixedModule = [NSMutableData dataWithBytes:&fixByte length:1];
 [fixedModule appendData:m];
 
 https://github.com/StCredZero/SCZ-BasicEncodingRules-iOS/issues/6#issuecomment-136601437
 
 */

- (SecKeyRef)publicKeyDataWithMod:(NSData *)modBits exp:(NSData *)expBits;
@end